Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, Properties, and Cross-linking Reactions of Poly(ester acetals)Robert W. LenzCite this: Macromolecules 1969, 2, 2, 129–136Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org/doi/10.1…
An adiabatiecopper ca l? rim e ter wa s used to determine th e heats of vul ca niza ti o n of pal e c re~e natura l rubber wIth s ulfur for mIxtures varying in com pos iti o n from 0 to 32 pe rce nt added s ulfur. The s id e rea ction that produces hydroge n s ulfide was avoided by us in " reacti on te mpe ratures nea…
Using as a base the Cd0‐B 2 O 3 ‐Si0 2 photoconducting glass previously found, various systematic substitutions and additions were made to determine their influence on the photoresponse of these glasses. Complete substitution of GeO 2 for SiO 2 led to the highest photocurrents observed in these glasses and to a shift…
Minimum-weight design of a portal frame for alternative loadings is discussed. A linear programming formulation is used. The concept of Foulkes mechanism as the necessary and sufficient condition for optimum is generalized for this class of problems.
Measurement of saturation magnetization and Curie temperature were made of the solid solutions (Fe1−yMny)1.67Ge for 0≤y≤0.4. The Curie temperature decreased linearly from 485° to 326°K while the saturation magnetization, in μβ per mole, decreased from 2.65 to 2.35 for y=0.2 and then increased up to 2.66 for y=0.4. The…
One of the unanswered questions in the study of fatigue is how cracks nucleate at stresses far below the static fracture strength. Previous theories show possible qualitative mechanisms that may operate in a crystal at room and low temperatures but none provides a quantitiative theory of this phenomenon. We show here…
The existing literature on UAl2-Al dispersions is surveyed and a comparison with similar data for UAl3-Al dispersions is attempted. The experimental work included the preparation of a practically single-phase UAl2 compound by induction-melting and its grinding to a predetermined particle size. The blending of UAl2 and…
It is demonstrated by means of freely corroding total immersion tests and anodic and cathodic polarization experiments, that small amounts of arsenic in solid solution in α-brass, effectively prevent dezincification even in the most agressive media. On the other hand, the addition of relatively large amounts of arseni…
The thermal diffusivity of the ThO2-UO2 system in solid solution was measured by laser pulse method at temperatures ranging from 20° to 500°C. Reproducibility of the data was confirmed to be within 3%. The compositions of the samples were ThO2, ThO2-1%UO2, ThO2-5%UO2 and ThO2-10%UO2. The thermal conductivity was calcu…
The effects of Y and Bi substitutions on spin reorientation in ErFeO3 have been studied through optical absorption and magnetization measurements. Below the reorientation temperature Tr, optical absorption lines from low-lying Er3+ levels show splittings of several cm−1. The splittings decrease above Tr. With addition…
The mature akinete coat of a Cylindrospermum species contains laminar layers, not present in immature akinetes, and a thickened intermediate layer.
The effect of micrestructure on the glass temperature Tg of poly (α-methyl styrene) has been investigated. It has been observed that Tg increases as the syndiotacticity of the molecule increases-thus Tg = 446 ± 2°K for polymer with 67% syndiotactic placements, while a value of Tg = 453 ± 2°K is found for a sample with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterpretation of the kinetics of thermogravimetric analysisEli S. Freeman and Benjamin CarrollCite this: J. Phys. Chem. 1969, 73, 3, 751–752Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org…
The compound Gd2CoMnO6 crystallizes with the orthorhombic perovskite structure and is isomorphous with GdFeO3. A crystal structure refinement shows that the Mn3+-O2−-Mn3+ bond angles are ∼ 145° and that the distortion from cubic symmetry is considerable. A spontaneous moment of 5 e.m.u./g develops below 115°K due to t…
An electron microscope investigation has been made of the decomposition of ⅓〈1120〉 slip dislocations when they penetrate {1012} deformation twin boundaries in polycrystalline zinc specimens. The results show that the decomposition can result in the formation of stacking faults in deformation twins and that these fault…
A processing programme is outlined in which yarn pre-twist, applied air-pressure, and supply-yarn overfeed are systematically varied in the air-jet bulking process to investigate their effects on air-textured nylon 6.6 continuous-filament yarns. Optical magnification of the air-textured yarns enables the average loop…
Summary It is pointed out with the help of the Independent Domain Theory, that a fraction of the pore‐water constituting a volume Δ V is contained in pores not common to both the wetting and drying states and that this volume in a wetting state is contained in pores whose draining radii are greater than those of the p…
Single crystals of α-manganese were grown by the distillation method. These weigh about 300 mg. Crystallographic parameters which define the positions of manganese atoms have been determined by x-ray diffraction. The magnetic structure was determined with better accuracy than that determined by the powder method. It i…
Polyethylene single crystals from dilute solutions usually have a density ρ which is less than that of the ideal crystal lattice (ρc = 1.000 g/cm3). This density defect can be formally assigned to an “amorphous” component (1-α) = (ρc-ρ)/(ρc-ρa) and may be caused by vacancies in the crystal lattice and/or by the surfac…
Abstract The density, congealing point, and hardness were considered in relation to crystallinity, determined by an infra‐red spectrometric method, of a series of waxes which are fractions from crude Fischer–Tropsch wax. Values ranging between 65 and 93, expressed as molecular percentages of crystalline material prese…